cardiac arrhythmia

NOUN
18 LETTERS · STARTS WITH C

cardiac arrhythmia is a valid 18-letter word worth 33 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
C3A1R1D2I1A1C3A1R1R1H4Y4T1H4M3I1A1
3 + 1 + 1 + 2 + 1 + 1 + 3 + 0 + 1 + 1 + 1 + 4 + 4 + 1 + 4 + 3 + 1 + 1 =33 PTS
DOUBLE WORD → 66TRIPLE WORD → 99
MEANING

What does cardiac arrhythmia mean?